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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c975716c76ea76e27639a19fe42190dd718a38f2101a82751fc8822df1a2708d' 
  AND token = '5Se8zcDznuIlvBtTT7+rmhYBgnsKpuKWM+guwP6G6ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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