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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7b2528cd2dec465bba35f566901e1709b0f20b0f162bf081a93dce0eb8aac9' 
  AND token = 'JY+Oi9VvqMNbHMN8f7eWrgVsVfVcqIqdqYphVV0Quzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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