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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2622c7bb3d2fc3aff56e26e74f93a6dda4d42ffe765be28ff61761981771eed7' 
  AND token = '1wsRG5WqVixFmOiVkpWy2Ko+S6qCsldRE2k5OTW72Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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