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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686e395be5012edb951f4403e37aedf4464bb08a5fb824b5c09a93eee441a4a5' 
  AND token = '5JonqtAWDgEI2JMVVJ3ogBx8FZmrrdwKmLUa7D9NB8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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