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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2af072b1dba275f1e3955244f5c426429db5e94b498817e6f7790092a378db' 
  AND token = 'c8Ne9HS0d1mkuy9XJPd5+Yw49P2Ma/LMjS9/sU5h0YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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