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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a150c0fd4ec99f94337d18ee4dc9e724d5069a0c2a917f5c90d95e7bfce0eb' 
  AND token = 'WyAV4TwSfKRtTdW134KF+Kqra4x5/DzLEGHsOhABJRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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