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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '467ef56018d99ec9e72c52027778f551627119516d1ff54f29df3a769926a51a' 
  AND token = 'd3pptdTF51LmHlBLpR1sc1CO63SZyJtBA9dVZB94Pns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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