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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f900c4cc6c6ed6cae2cbb2371e74112f9e83ee685895b72fdd13d81f8e4a17d7' 
  AND token = 'PaUQqQa9amRjTc+u4+Pb5mo9bylgk6FFieq7hLI4trM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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