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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a603649b9933802cbdea2477105961abf6f035a8cbfba6891227eefc17549fff' 
  AND token = 'bJzH6TLfD88meXzgzVAnAgPiPVxeWZnp2AVR6OcSrn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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