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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbbeb06555ea44b1d98345c7b1e823aa1bf6be87d436608f9ee4761d5ef0d5b3' 
  AND token = 'yj2Fx0vRpm8LEZxlO5/z4CWguaSkcDObiLIDlz9esuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00186

JSON explain

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