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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6777f81beeca3168c4422d3602ad4a86d974687061c824259f2179510374d12f' 
  AND token = 'ht7v1w2HmkptrDgyT0+5HTj7qKZo28vwTaPINTJAON4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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