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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a4047c47fe16ec3eca5ba5b173bbd2148cf1d8f562f48aeed08cb55f1722448' 
  AND token = 'DFiCt3MRJEg7lo3UKq97Q9RKHdRlIXle7irTBbKVNSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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