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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c8805996384a5f8ef924dbbb3521d223091c29360d84ef733a04994b9c6fae4' 
  AND token = 'Iy0fpa1uZ4EithLjk0HLgnP/89nLikYsnhrpFPSo62I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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