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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc298a32b02a1f42efc1ab4ce6f9fff7830ce9db15927ff31721722cadacdba2' 
  AND token = 'gbvcG1JDdsULlpKLwvLBuyAKk7x2lzsolhSNFl+2h5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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