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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c0fdb214b366ecf320a9408e314fa42a6be819b8fb1fe9d7bbd246fcfada79' 
  AND token = 'KZbAIKhlVEbsfwG596Bw7+6SjqOITSTNf6xu0U4K25c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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