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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b4c95cc5bab1ab3a18654dd4e5728f892a476a7e7fd5ba977b2107cf51db9d9' 
  AND token = '1km/1i6wa9flpSLCCZMlsCAIxujRYH+l85czWHuTte0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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