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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2311e59b09bfd004f6480011211084348739fb654dbb2b0b32da7ffb3ecca46e' 
  AND token = '37+nwn5B146s7goHxLk1ejDgmgSl2Mhu+FttmOwMEC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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