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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa4766a9c42b00093780cca0ef522a24ac16ed34fd7b6165e5e26aa756df9e7' 
  AND token = 'CSQeqV/2d2v0unQU4dDhahQeBmRN1Yv35y05px3NyFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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