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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6829ee69004407ae008768a5b6b039ed7996cc96952475cfff3e8faa1d8d6bb' 
  AND token = '93TMSpv+HYvO0wLuE80swTp7i+2b9y0DzcVJAzfNIR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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