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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8aaf1006fa292034074ef2eef7e26ef74a048d82ecd64e38d6edd6ddd88f8c' 
  AND token = '9ldhAapWInmUOP3D0JBEU1ftWmx0rF0LGcnsa+XJ910=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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