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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efc365918eeeffadc9c58cebb7069575f95425e07f9b4596d19a849d5a239d4' 
  AND token = 'exBZQ8lPoI1/oXcecwfmM/dNonyVNkbRbyJ+P+c+V8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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