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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ce31f369191a6e2c64b10334eba55822c96d57ab7597522ef71ef90ce25a97' 
  AND token = 'qKF2nPJSiaEBdVe0TH7FGmq+NFY9lIqgAL6wAraTkxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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