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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875f7d9252a6ded48c6f4378f9f31dbcc558ed2fc011656c7d9d465103e44cf8' 
  AND token = 'mtThxt2fIXGSclYSuJpyLKs7vj9PDN5FArEM7cXio14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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