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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2b3911f7d4190b2dc3058bb4647c8bae740d066e8ee24fb18c8f132686b8fb' 
  AND token = '6T83VSBVYMokQSfzePfrzXFOfR9iNSN4GIO+GZRexHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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