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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90751924241888a27b724b4e02b81cfd9b3dc4064688b37b2ce753ceb2ace117' 
  AND token = 'N0mE5AcTC5ji0XLLnPuhMX34HbFmXzHnHK+Ba1dtshc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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