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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95caa0257cb01204b1772b91666452580ce8ea5d6b12b5fa2d94085fb60d8b7f' 
  AND token = 'NN9/nvKSdVErDqM85KiutsM5YSKAO3Bpd5vwgA7xHgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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