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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7c42cf0ad2c9b133504e58331001baaf03420f851a248e24c941fedfdc3bab' 
  AND token = 'baj2rBMIHekl6rThw2miZmfT2v5uH9c8PbCAbdoQzlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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