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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df397b0c902e6fcf93f576b6e51c3848e782e955141aa4a13b58ebb475a4cfc' 
  AND token = 'mo4MU2qfauoewVTeiougnaRIk1GT8eO8S7OoP0rZJaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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