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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93612e3df34cb322d4c616d351d4e7c3983bd4b6d8df066499b5b01f8220777c' 
  AND token = 'Xd4vE0HquoSMkVWevjTWzhOMWTtv8NypCkLJ7PdTX1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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