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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ceeb460ecb97651556df4a683f2fa76be0719d575adf30ff10191d1641dbbe4' 
  AND token = 'cdGvzyhf+uIL5VrWpS+RWNdswMduslSQxLUBGb82j7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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