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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8305a0d809f5e7ca0acfb71e3cf69c1c9d417086fc6cb534130deb6946d8873' 
  AND token = 'yLy1fUNVQjyUA6Dkr8A7XxkhoNEdd84QHwMuKEC+Qnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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