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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43265549d54d5ed70090a0d9e0d9f01313334dfcd1362f6ed96611e594f726b' 
  AND token = 'UHX81HTS8vptip3Q8urHxLytE4m/4Hy3WDTWkgEQilU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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