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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a077698cc5eee71d30a22d647963fe7f901b7077b54d4c66692cf8fa17ae6c12' 
  AND token = '0aUOVmb2Xl5Ry6OkHENe5uAE28DjLBTLa+ysTarDy2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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