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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a7ae0f0169696e35503792cab6cfbc176680df2865c8810cf336161e5e86b9' 
  AND token = 'E3RS3iPO0TmF2YIkDzY0z716Npa6ai4mIYHk/IBznVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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