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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61df5a63dd0db45cffd5598633a9cec98dd2b015e2a3ec20d4b31128e171b688' 
  AND token = 'iReuoqm08BuGJDypw/7qeUuWdertQG5KJgBdQ8Nanic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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