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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c86921886425b47c2cd33d8cc147ed1c7d722cd50f518261826a6df977e54f1' 
  AND token = 'VrZNILkMFeGRsgxMTnZ1VEMQWBOzIYStcCSjQGwRjSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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