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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd0afa85123795321b8c9a3725fdb67c6475806aa85036143b67fb663233508' 
  AND token = 'c/cEle7cVciz4vvL0lFqFtDRlwNe/OSWWTBkqH+9g8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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