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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de3eff8ccd958bfa824f15a612f46b2efdbee6f1d9af070371bb5238c934ddc' 
  AND token = 'RQeWqiguXTg7ZqJn9g5Ky46E/SatMcejPLseN2ZUa3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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