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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e63f8c0e019e5ac30993c9ad0d35bb8d4a43878bd12e0aed29c4367c99244c' 
  AND token = 'bSCGeCZcS1AycjX76ZCTMKFiA5PwENzD5sNXgBaAgns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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