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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630c11bcfc6d69c52e24f0f6adaa9ef06d1a12c5dce2947f70f661286857199e' 
  AND token = '/mos3tK9F82GZBaqZaELH8iyObuDZyEdgoP2IUh/qcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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