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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3144f9eda0aa5f5de0661c94a53d02538546781e5bfa0d505d569b94ea861a1' 
  AND token = '9KePEWbT3wz5emhr1QVU8CjBEeFIUwtQ34xQaAGDemk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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