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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c022b8a765a4feb289067c6d773047865ce4795afa8458f665a2256f31388b' 
  AND token = '68A/x5sopcgwEGcbGl5FUbxTZHZtLxilTS+cjaq1hCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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