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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '501d05013cb2a1ff8c5d5714f6c9c63b07ad13aff962421cc66425542116dffe' 
  AND token = 'dzIn1Wf84gVNHdzWDIhfDBvcl12CAX/3If1YjTGT8uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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