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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb008b15428edd900fe41a70b22c3d236010c8dea18d8f2240350be5cd40f5e' 
  AND token = 'r8KTZBQ2b4d4Pmm7xA11oo10/PNCS2+6jlzmbzLhrxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}