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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5069ace0f1042c438fbe4dd9fedb4b030ff369e8a4f81f440a59a45d6dca01a0' 
  AND token = 'lHyTzx4iebpHb0grO8ClKsYtd3B+vVWSLAflTSt3mR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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