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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add9af38630d002eeb6a34ac57b27c994abf91cf656857e5115b4423e43a008e' 
  AND token = 'fgUGs3/V2W4aUUxNHea2aGq9OGPtkdj2KtinW+MXME0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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