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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3dfe26c8d71910e4cc494d53e756b1b82099ef8f0b1cd7ca0661d3f396627e0' 
  AND token = '9TDihVobBsFMZZA6/Y0b5H15fkksaz66EkCZbi9+ETU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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