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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a71748e2f7ac2a16605e0f854aea0381f364d01794c221e415ad41af5f4b00' 
  AND token = 'AV5JRjlC7u3e0GUBOdr42pYkAGBIZnNuMmQUukAGJvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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