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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae7f564ebea39038cf37392c20abe6c9bf5590939a03b0f6153f0e80dd8d7eb' 
  AND token = 'XYvnDpdGx07QG47xHfTHuIDjznsXGUoRfKZl9taA9ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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