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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44d41339819347a1c4cf30e20a5c4efedae5e50e51d5fa396435152aa2f83d0' 
  AND token = 'T30+uOu5zvSUbgkdsLS5NAoC/s6TF+xFSsQ42s51hQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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