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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b479b6c4a0f436dfdc845d4caa10e8fe79ad5413857615ff2ea7d39250408ca4' 
  AND token = 'lbWx46S13Uw+PAlxJ0MJ5UIDaP+DIervrG7J0nbRL8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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