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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026dd8af5113ff18cf01ccb0be3909ca6f94effc21f711e9c826ef40e14300f9' 
  AND token = '0FMd1cRv6jUzfS1jrGDQ+29W6Jo1lLRw9J0TU4Uul6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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