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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8832346bf7d2c792394fd8548db2a82b4f5ac48fed420e50a4e80ef90ade6711' 
  AND token = 'mD+TSqxdIsdSEtH1YGcamaWLFwt0tFPKuI+1nMY/R9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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