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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988219b936d6a4919618d60fd34a4a087e0b03daba8dd5475a9bb19457dab784' 
  AND token = 'jdJxZHXglOFHFeAS4OZ4HQV8WYQRD1aLXAqlIqvZeOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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