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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f019404a27c4bfffcbded7f22ef1b3950a3a69d50ad02f2119ff7a7a7e79e3b4' 
  AND token = 'dNFsRquaJ/0W+81f5g17GZy9CqOt1oZ7sug8k2dN9IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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