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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63c3534397d5658240f54c36e06d65bbe3676d7e0027fe3c45f7b70cb4387a1' 
  AND token = 'E3bZ3N4fO/fx3sR+Zm0X99zTk1okgnWNwShYxJfv12U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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