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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5a3a0a4bd88af381e048efd60ba01fec21ae6bc3d9f158f86d343a20964f2f' 
  AND token = 'F8J5Lo06SF8AqNEqvCpAFGBihrAtEuMIha9IH1gVAYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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