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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb570ff1c1142f5c574f9b8fd009de38213d56c1d4e23f9cec63f19b5dc513e8' 
  AND token = '9r+ns6orahsK8dmHDYuyf91NANrAVbGNtYOQ8IbJmrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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