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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef5d88ce964262cb3453a2879d1fa8597f453918cc78c56e0162c4058763d47' 
  AND token = 'Wp7C+vYA7iQcuIQe/5g1KorffKwKjQmeeC+7VjwyWto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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