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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1dbe7aede8a89c2713208c9ce5591705da7fb5b6bc2945afbc6cd3e5a0e8e33' 
  AND token = 'NcSDptLAua4W8qnEc935cA0F/J0Awy3oC+xxIzsGHoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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