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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e120adc06585a0c599dc7e99aa059567c5a8997f5ff3efbc2af808f9cc7e6d8' 
  AND token = 'Rs++FaeI4eQ1KNrxc7Ih6qMmdaEV9Cv71VTLtNEEyuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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