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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23d0033aecd725ba125c59961458eb629c08eb2324036a7335e146914be796d' 
  AND token = 'Z48Tfl0Tdkhnc3351/MC749wCcR3janT1wn6ePzj7QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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